It wasn't raining for a change so I took a fork to the Oxalis tuberosa and dug it up. Underneath were the Oca tubers. A quick rinse got the soil off the waxy skin and I sunk my teeth in. Crunchy. Sharp. I know it's gardening/culinary cliché but they really are "nutty". Brazil nutty.
Above: The plant in summer
Growing and eating ocas
Plants For a Future page about Oca
Realseeds - suplier